CA1044708A - Method for mining of rock or ore according to the block caving principle in massive formations - Google Patents
Method for mining of rock or ore according to the block caving principle in massive formationsInfo
- Publication number
- CA1044708A CA1044708A CA233,703A CA233703A CA1044708A CA 1044708 A CA1044708 A CA 1044708A CA 233703 A CA233703 A CA 233703A CA 1044708 A CA1044708 A CA 1044708A
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- Canada
- Prior art keywords
- drifts
- draw
- drift
- block
- points
- Prior art date
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Links
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005065 mining Methods 0.000 title claims abstract description 20
- 239000011435 rock Substances 0.000 title claims abstract description 16
- 230000015572 biosynthetic process Effects 0.000 title abstract description 3
- 238000005755 formation reaction Methods 0.000 title abstract description 3
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000005422 blasting Methods 0.000 claims description 16
- 238000000605 extraction Methods 0.000 abstract description 4
- 238000011068 loading method Methods 0.000 description 12
- 238000005553 drilling Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000013467 fragmentation Methods 0.000 description 2
- 238000006062 fragmentation reaction Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- BHKKSKOHRFHHIN-MRVPVSSYSA-N 1-[[2-[(1R)-1-aminoethyl]-4-chlorophenyl]methyl]-2-sulfanylidene-5H-pyrrolo[3,2-d]pyrimidin-4-one Chemical compound N[C@H](C)C1=C(CN2C(NC(C3=C2C=CN3)=O)=S)C=CC(=C1)Cl BHKKSKOHRFHHIN-MRVPVSSYSA-N 0.000 description 1
- 101100496105 Mus musculus Clec2e gene Proteins 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 235000019994 cava Nutrition 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000009740 moulding (composite fabrication) Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000010878 waste rock Substances 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/22—Methods of underground mining; Layouts therefor for ores, e.g. mining placers
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Remote Sensing (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Earth Drilling (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
Inventor: Erik Igvar Janelid Title: Method for mining of rock or ore according to the block caving principle in massive formations.
Abstract:
There is provided a method for extraction of rock or ore accord-ing to the block caving principle comprising driving, at several levels, principally straight, parallel and horizontal drifts into the lower part of a block, choosing the distance between the drifts at each level so that remaining supporting pillars will covers at least 40 % of the block area, undercutting the block from the drifts in such a way that the drift openings toward the undercut area and the drift coverings will be arranged in steps, the drift openings being utilized as draw-points for the caving material and the number of drift levels being chosen with regard to desired horizontal distance along the direction of the drift between the draw-points at adjacent levels.
Abstract:
There is provided a method for extraction of rock or ore accord-ing to the block caving principle comprising driving, at several levels, principally straight, parallel and horizontal drifts into the lower part of a block, choosing the distance between the drifts at each level so that remaining supporting pillars will covers at least 40 % of the block area, undercutting the block from the drifts in such a way that the drift openings toward the undercut area and the drift coverings will be arranged in steps, the drift openings being utilized as draw-points for the caving material and the number of drift levels being chosen with regard to desired horizontal distance along the direction of the drift between the draw-points at adjacent levels.
Description
~ l i 10~708 The inventiorl relates to a method for mining of rock or ore according to the block caving principle in massive formatlons.
Underground mining is in principle carried out either by drilling and blasting the ore or by undercutting a certain area, causing the ore to crack up and start caving, being further ;
¦fragmented during gravity flow to the draw-points. A general name .. for the latter methods is block caving. This method is primarily used f`or extraction of large, low-strength orebodies, which for mining need to be divided into several blocks, and when the ore easily crack up into small pieces when t~)e material moves toward the dr-awpoints. Lim:itations of the usefulness of- block caving are resistance to frag,men~ation of the ore, required secondary blast-ing of boulders and practical problems with the arrangement of stable and safe workings under the block for loading out the ore.
The principle for preparing a block is to arrange a loading level with conical draw-points ïn the ore up to an undercutting level, located about 10 meters above the loading level. The caving starts ~rom the unc1ercutting level. When ore is loaded out of the draw-points, new ore caves down from the block above.
In order to get an even draw of the caving block and thereby avoid ore losses and waste rock dilution it is important that the distance between the draw-points is not too long, particularly in relation to the size of the draw-point openings and the height of the block. Besides, loading should be rather evenly distributed between the various draw-points.
~or loading, the caving properties and Pequired secondary blasting are the substantial factors for dimensioning of the draw-point openings and for the loading method.
Under favourable conditions, block caving is a very efficient~
low-cost mining method. However, for high strength ore with coarse ~
Underground mining is in principle carried out either by drilling and blasting the ore or by undercutting a certain area, causing the ore to crack up and start caving, being further ;
¦fragmented during gravity flow to the draw-points. A general name .. for the latter methods is block caving. This method is primarily used f`or extraction of large, low-strength orebodies, which for mining need to be divided into several blocks, and when the ore easily crack up into small pieces when t~)e material moves toward the dr-awpoints. Lim:itations of the usefulness of- block caving are resistance to frag,men~ation of the ore, required secondary blast-ing of boulders and practical problems with the arrangement of stable and safe workings under the block for loading out the ore.
The principle for preparing a block is to arrange a loading level with conical draw-points ïn the ore up to an undercutting level, located about 10 meters above the loading level. The caving starts ~rom the unc1ercutting level. When ore is loaded out of the draw-points, new ore caves down from the block above.
In order to get an even draw of the caving block and thereby avoid ore losses and waste rock dilution it is important that the distance between the draw-points is not too long, particularly in relation to the size of the draw-point openings and the height of the block. Besides, loading should be rather evenly distributed between the various draw-points.
~or loading, the caving properties and Pequired secondary blasting are the substantial factors for dimensioning of the draw-point openings and for the loading method.
Under favourable conditions, block caving is a very efficient~
low-cost mining method. However, for high strength ore with coarse ~
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¦fragmentation during caving an(l thereby a great number of boulders ¦at the clra~l-point, the loadingr capacity clecreases very rapidly unless both draw-openings and machines are big.
l Big loaders require large draw openings and large haulage !drifts, which also means that a smaller part of the ore remains as~ -~
jlsupporting pillars at the loading level, since the distance ¦¦between the draw openings should not be too long. Thereby, extensive reinforcement work with roof bolting, steel supports, concrete etc. is required. Thus, a poor fragmentation of the ore generates two very difficult and costly problems, viz. secondary blasting Or boulders and reinforcement of draw openings and haulage drifts.
Boulder blast:ing is carr:ied out with known technique in and from the draw openings which is both expensive and difficult and, ¦above all, very risky.
The known technique of block caving in large, massive ore-bodies is planned and used at e.g. Climax and Henderson, USA, and , El Teniente and El Salvador, Chile.
~or block caving in inclined orebodies of limited thickness ¦
an other technique for preparation and m:ining is used which is specifically distinGt from the technique descr:ibed above. One practical form of this known technique is described in the Swedishi patent No. 36LI,339, and reference can be made to applications at ¦
the Creighton mine, Canada, and the Grace mine, USA.
Known block caving technique is further described e.g. in "Underground Mining Methods1' worked out by AIME, USA.
One objective of the present invention is to improve the stability of draw-points and haulage drifts.
Another object is to facilitate the undercutting of blocks.
Another objective is to faciliatate secondary boulder blast-¦
ing and removal of hangups.
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~ 49~
¦fragmentation during caving an(l thereby a great number of boulders ¦at the clra~l-point, the loadingr capacity clecreases very rapidly unless both draw-openings and machines are big.
l Big loaders require large draw openings and large haulage !drifts, which also means that a smaller part of the ore remains as~ -~
jlsupporting pillars at the loading level, since the distance ¦¦between the draw openings should not be too long. Thereby, extensive reinforcement work with roof bolting, steel supports, concrete etc. is required. Thus, a poor fragmentation of the ore generates two very difficult and costly problems, viz. secondary blasting Or boulders and reinforcement of draw openings and haulage drifts.
Boulder blast:ing is carr:ied out with known technique in and from the draw openings which is both expensive and difficult and, ¦above all, very risky.
The known technique of block caving in large, massive ore-bodies is planned and used at e.g. Climax and Henderson, USA, and , El Teniente and El Salvador, Chile.
~or block caving in inclined orebodies of limited thickness ¦
an other technique for preparation and m:ining is used which is specifically distinGt from the technique descr:ibed above. One practical form of this known technique is described in the Swedishi patent No. 36LI,339, and reference can be made to applications at ¦
the Creighton mine, Canada, and the Grace mine, USA.
Known block caving technique is further described e.g. in "Underground Mining Methods1' worked out by AIME, USA.
One objective of the present invention is to improve the stability of draw-points and haulage drifts.
Another object is to facilitate the undercutting of blocks.
Another objective is to faciliatate secondary boulder blast-¦
ing and removal of hangups.
- 3 -,
4'7(~8 Another objective is to make it possible to locate the draw-points close to each other, while maintaining large pillar area ~or support.
According to the invention there is provided a method for mining of rock or ore according to the block caving principle, comprising driving, at several levels, substantially straight, parallel and horizontal drifts into the lower part of a block, choosing the distance between the drifts of each level so that remaining supporting pillars will cover at least 40% of the block area, and undercutting the block from the drifts in such a way that the drift openings toward the undercut area and the drift coverings will be arranged in a stepped configuration, the drift openings being utilized as draw-points for the caving material, the number of drift levels being chosen with regard to desired horizontal distance along the direction of the drifts between the draw-points at adjacent levels. The p:illar area may well be larger than 50%, preferably larger than 60%.
~lere "covering" is de~ined as the layer of solid rock or ore, form-ing the roofs of the drifts.
The invention is specifically suited for mining of large formations which must be mined in several separate blocks.
If the draw-points must be retreated far back due to weak rock in the drift opening area, a new draw-point leading level may be arranged under the previous levels with the draw-points of the new level located so that the distribution of loading points over the area of the block is evened out.
If the original draw-points are arranged in a vee-shaped plane, the draw-points of a new level should be located under the point of the "vee".
~i . - .~
,, . ~ , .
r-~ f 10~ 7 I tn the following, the invention wi:Ll be closer described by ¦ examples, by reference to the enclosed drawings. ¦
~ig. 1 shows a vertical section through a block to be inined.
Figs. 2 and 3 show sections taken along lines II-II and ¦
III-III, respectively, in ~ig. 1. ¦
~igs. 4 and IIA show schematically a horizontal and a verti-cal view, respectively, of an alternative preparation ~or mining ~ -according to the invention.
Fig. 1 shows a part of an ore-block with a width of e.g. !
115 meters. Its length as is shown in Figs. 2 and 3 can be e.g. ~ ;~
120 meters. Straight, parallel and horizontal drifts 1 are driven ¦
thx-ough the block at four levels. 'I'he dri~ts of ad,jacent levels are located in separate vertical planes.
The drift 8 1 in which loading is to take place, are located ~
at a horizontal distance of 15 rneters and a vertical distance of I -8 meters ~rom each other. The width of the drifts is 5 meters and ¦
¦ the heieht 3 meters Consequently the remainlng pillars at a certain level cover about 75 % or more than 70 %, of the total block area. The distance between the drifts can be chosen with regard to the strength and stability of the ore body in which the block is to be mined. I'he block is undercut from the uppermos~t level of drifts 1 by blasting in fan-shaped planes 3 against a slot or a raise in the center along section ll. By fan-drilling ;~
and blasting as according to the sublevel caving method, the drifts of the uppermost level are retreated to points 5. At underlying levels drilling and blas~ting is carried out in the same way but stopping at points 6, 7 and 8, respectively. The horizontal distance between these points, e.g. between points 7 and 8 in ~ig. 2, can be chosen according to wish (in this case 15 meters), but it has influence on the required nurnber of levels.
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I
The cavin~ ore from the unclercut block is loaded out at points j5-8, and these points can therefore be sa;d to be draw-points.
According to the system described above, the horizontal distance between the draw-points can be varied between very wide limits without reducing stability, which is a great advantage of this invention. , ' Access to the various drift levels or draw-point levels is obtained e.g. through ramps 9 and lO,respectively, outside the block or at the boundary between two adjoining blocks. (The ramps and dump drifts are only indicated in principle.) Gathering ~ ' systems or ore dump drifts 19 and 20, respec'tively, which may be used in connection with the lnventlon, are shows in Fig. 3.
However, it sho~lld be notecl that there is no need for drlv-ing the drifts 1 through the whole block when preparing it for 15~ mining. Instead, drifts e.g. according to the pattern shown in Fig. 1 can be driven from opposite sides of the block up to !:
points above 6, 7 and'~ and to centerline 4 in Fig. 2, respectively~.
That is the top level drifts are driven past point 5 to a posit-ion corresponding to draw-points 6 of` the adjacent llnderlying drift level, and so on.
The block can then be undercut by drllling and :lasting in towards the block from the said points, while bringing down the ' ¦ ;
covering at the innçr part of these drifts, so that a configurat- ¦
ion according to Figs. 2 and 3 is obtained-A very great advantage of the described system is that if the drift wall or roof around the draw-point opening of the drift at points 5, 6, 7 or 8 become damaged during loading or due to blast-ing, the damaged part can be blasted away and the vertical wall ' at points 5, ~, 7 and 8 retreated e.g. some meters, until a solid !
wall is restored. In the system applied in known block caving technique, the location of the draw-points must be maintained, .- . , . ....... , ,___.___ .~ L4'7~
which reqlliret; extensive an(l ~ostly r~c~irll'or~cement work If in a systern acc:ord]ng tu t~e preserlt invention~ t~le c~raw-points must be retreated several times, a new draw-point level may be arranged under the block with draw-points centrally located so that ore-rests under t~le center of' the block can be loaded out. This is ;~
indicated in Fig. 2.
For bringing down hangups caused by bi;g boulders and for blasting of boulders above the draw-points, access drifts 11, j opening out into the solid rock wall 12, are arranged in the pillars or in the covering of the drifts. These access drifts can be entered either through raises 13 from the adjacent draw-point level or throllgh connecting horlzont;al driftc; 14 f'rom the draw--point level located above.
When loa-llng out tbe caving ore, substantially stationary 15, ore-piles 15 ~see Flg. 2) will be formed on the coverings of the drifts in the undercutting area. The ore-piles 15 will then form parts of the funnel-shaped draw openings up to the caving area. 3 ;
As is shown in Figs. 2 and 3, the coverings of the drifts and the vertical end walls 12 of the coverings can be said to be arranged in steps, and this stepped con~iguration is characteristic ~or the invention.
In Figs. 4 and 4A are shown three blocks Dl, D2 and D3 respectively in an orebody. Preparation for mining is here carried ¦
out with drifts from only one side of the ore-blocks. This gives the coverings an arrangement in single steps as indicated in Fig.
4A, as distinguished from the arrangement in double steps, shown in Fig. 2. The drifts can be driven longitudinally through the orebody according to the pattern sho~ in Fig. 1, and then block IDl is undercut along shown step shape. When the ore in block Dl ~has been loaded out, the same loading drifts may be retreated i .:. ' ' 7~
¦under block D2 in order to directly start the:reby undercutting in ¦
step arrangelrlent and loading, and after extraction of all ore in block D2 the drif`ts may be retreated under block D3 for ore extraction in the same manner etc. With this step-wise shifting, a kind of continuous mining method is achieved.
Of course the arrangement in single steps shown in e.g.
~block Dl in Fig. 4A, can easily be adapted to an inclined ore face.
Fig. Il i.s a horizontal section taken along line A~A in ~Fig. 4A and shows only the drift extent within the separate blocks.
In practice, the drifts of Dl may extend only a short distance into D2, the transport drifts and ramps then be:ing located in D2 close to Dl. After block Dl has been mlned according to the block caving principle, the result,in~ :lower part of the b:Lock may be ~ined by the sublevel cav:in~ prlnciple which can be carried on until the indicated position in block D2 is achieved, whereafter block D2 can be mined by the block caving principle, and so on.
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According to the invention there is provided a method for mining of rock or ore according to the block caving principle, comprising driving, at several levels, substantially straight, parallel and horizontal drifts into the lower part of a block, choosing the distance between the drifts of each level so that remaining supporting pillars will cover at least 40% of the block area, and undercutting the block from the drifts in such a way that the drift openings toward the undercut area and the drift coverings will be arranged in a stepped configuration, the drift openings being utilized as draw-points for the caving material, the number of drift levels being chosen with regard to desired horizontal distance along the direction of the drifts between the draw-points at adjacent levels. The p:illar area may well be larger than 50%, preferably larger than 60%.
~lere "covering" is de~ined as the layer of solid rock or ore, form-ing the roofs of the drifts.
The invention is specifically suited for mining of large formations which must be mined in several separate blocks.
If the draw-points must be retreated far back due to weak rock in the drift opening area, a new draw-point leading level may be arranged under the previous levels with the draw-points of the new level located so that the distribution of loading points over the area of the block is evened out.
If the original draw-points are arranged in a vee-shaped plane, the draw-points of a new level should be located under the point of the "vee".
~i . - .~
,, . ~ , .
r-~ f 10~ 7 I tn the following, the invention wi:Ll be closer described by ¦ examples, by reference to the enclosed drawings. ¦
~ig. 1 shows a vertical section through a block to be inined.
Figs. 2 and 3 show sections taken along lines II-II and ¦
III-III, respectively, in ~ig. 1. ¦
~igs. 4 and IIA show schematically a horizontal and a verti-cal view, respectively, of an alternative preparation ~or mining ~ -according to the invention.
Fig. 1 shows a part of an ore-block with a width of e.g. !
115 meters. Its length as is shown in Figs. 2 and 3 can be e.g. ~ ;~
120 meters. Straight, parallel and horizontal drifts 1 are driven ¦
thx-ough the block at four levels. 'I'he dri~ts of ad,jacent levels are located in separate vertical planes.
The drift 8 1 in which loading is to take place, are located ~
at a horizontal distance of 15 rneters and a vertical distance of I -8 meters ~rom each other. The width of the drifts is 5 meters and ¦
¦ the heieht 3 meters Consequently the remainlng pillars at a certain level cover about 75 % or more than 70 %, of the total block area. The distance between the drifts can be chosen with regard to the strength and stability of the ore body in which the block is to be mined. I'he block is undercut from the uppermos~t level of drifts 1 by blasting in fan-shaped planes 3 against a slot or a raise in the center along section ll. By fan-drilling ;~
and blasting as according to the sublevel caving method, the drifts of the uppermost level are retreated to points 5. At underlying levels drilling and blas~ting is carried out in the same way but stopping at points 6, 7 and 8, respectively. The horizontal distance between these points, e.g. between points 7 and 8 in ~ig. 2, can be chosen according to wish (in this case 15 meters), but it has influence on the required nurnber of levels.
_ 5 -: .
~ .. . . .... . .. . , ... ...... _.. . _ __ ... __ ~_ __ .. ., .. ..... .. . .. _~ .. _ __ ¦l ~F~ Q~
I
The cavin~ ore from the unclercut block is loaded out at points j5-8, and these points can therefore be sa;d to be draw-points.
According to the system described above, the horizontal distance between the draw-points can be varied between very wide limits without reducing stability, which is a great advantage of this invention. , ' Access to the various drift levels or draw-point levels is obtained e.g. through ramps 9 and lO,respectively, outside the block or at the boundary between two adjoining blocks. (The ramps and dump drifts are only indicated in principle.) Gathering ~ ' systems or ore dump drifts 19 and 20, respec'tively, which may be used in connection with the lnventlon, are shows in Fig. 3.
However, it sho~lld be notecl that there is no need for drlv-ing the drifts 1 through the whole block when preparing it for 15~ mining. Instead, drifts e.g. according to the pattern shown in Fig. 1 can be driven from opposite sides of the block up to !:
points above 6, 7 and'~ and to centerline 4 in Fig. 2, respectively~.
That is the top level drifts are driven past point 5 to a posit-ion corresponding to draw-points 6 of` the adjacent llnderlying drift level, and so on.
The block can then be undercut by drllling and :lasting in towards the block from the said points, while bringing down the ' ¦ ;
covering at the innçr part of these drifts, so that a configurat- ¦
ion according to Figs. 2 and 3 is obtained-A very great advantage of the described system is that if the drift wall or roof around the draw-point opening of the drift at points 5, 6, 7 or 8 become damaged during loading or due to blast-ing, the damaged part can be blasted away and the vertical wall ' at points 5, ~, 7 and 8 retreated e.g. some meters, until a solid !
wall is restored. In the system applied in known block caving technique, the location of the draw-points must be maintained, .- . , . ....... , ,___.___ .~ L4'7~
which reqlliret; extensive an(l ~ostly r~c~irll'or~cement work If in a systern acc:ord]ng tu t~e preserlt invention~ t~le c~raw-points must be retreated several times, a new draw-point level may be arranged under the block with draw-points centrally located so that ore-rests under t~le center of' the block can be loaded out. This is ;~
indicated in Fig. 2.
For bringing down hangups caused by bi;g boulders and for blasting of boulders above the draw-points, access drifts 11, j opening out into the solid rock wall 12, are arranged in the pillars or in the covering of the drifts. These access drifts can be entered either through raises 13 from the adjacent draw-point level or throllgh connecting horlzont;al driftc; 14 f'rom the draw--point level located above.
When loa-llng out tbe caving ore, substantially stationary 15, ore-piles 15 ~see Flg. 2) will be formed on the coverings of the drifts in the undercutting area. The ore-piles 15 will then form parts of the funnel-shaped draw openings up to the caving area. 3 ;
As is shown in Figs. 2 and 3, the coverings of the drifts and the vertical end walls 12 of the coverings can be said to be arranged in steps, and this stepped con~iguration is characteristic ~or the invention.
In Figs. 4 and 4A are shown three blocks Dl, D2 and D3 respectively in an orebody. Preparation for mining is here carried ¦
out with drifts from only one side of the ore-blocks. This gives the coverings an arrangement in single steps as indicated in Fig.
4A, as distinguished from the arrangement in double steps, shown in Fig. 2. The drifts can be driven longitudinally through the orebody according to the pattern sho~ in Fig. 1, and then block IDl is undercut along shown step shape. When the ore in block Dl ~has been loaded out, the same loading drifts may be retreated i .:. ' ' 7~
¦under block D2 in order to directly start the:reby undercutting in ¦
step arrangelrlent and loading, and after extraction of all ore in block D2 the drif`ts may be retreated under block D3 for ore extraction in the same manner etc. With this step-wise shifting, a kind of continuous mining method is achieved.
Of course the arrangement in single steps shown in e.g.
~block Dl in Fig. 4A, can easily be adapted to an inclined ore face.
Fig. Il i.s a horizontal section taken along line A~A in ~Fig. 4A and shows only the drift extent within the separate blocks.
In practice, the drifts of Dl may extend only a short distance into D2, the transport drifts and ramps then be:ing located in D2 close to Dl. After block Dl has been mlned according to the block caving principle, the result,in~ :lower part of the b:Lock may be ~ined by the sublevel cav:in~ prlnciple which can be carried on until the indicated position in block D2 is achieved, whereafter block D2 can be mined by the block caving principle, and so on.
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Claims (16)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for mining of rock or ore according to the block caving principle, comprising driving, at several levels, substantially straight, parallel and horizontal drifts into the lower part of a block, choosing the distance between the drifts of each level so that remaining supporting pillars will cover at least 40% of the block area, and undercutting the block from the drifts in such a way that the drift openings toward the under-cut area and the drift coverings will be arranged in a stepped configuration, the drift openings being utilized as draw-points for the caving material, the number of drift levels being chosen with regard to desired horizontal distance along the direction of the drifts between the draw-points at adjacent levels.
2. The method in claim 1 and further blasting down said drift cover-ing to retreat the draw-points if cracks and cave-ins occur in the coverings at said drift openings.
3. A method for mining of rock or ore according to the block caving principle, comprising driving, at several levels, substantially straight, parallel and horizontal drifts into the lower part of a block, choosing the distance between the drifts of each level so that remaining supporting pillars will cover at least 40% of the block area, undercutting the block from the drifts in such a way that the drift openings toward the undercut area and the drift coverings will be arranged in a stepped configuration, the drift openings being utilized as draw-points for the caving material, the number of drift levels being chosen with regard to desired horizontal distance along the direction of the drifts between the draw-points at adjacent levels, providing access drifts above said draw-points for taking down hangups formed by large boulders and for secondary blasting of said boulders, and connecting said access drifts to the draw-point drifts.
4. A method as claimed in claim 3, in which the connecting of the access drifts to the draw-point drifts is effected via a raise from the adjacent draw-point level.
5. A method as claimed in claim 3, in which the connecting of the access drifts to the draw-point drifts is effected via a horizontal drift from a higher draw-point level.
6. A method for mining of rock or ore according to the block caving principle, comprising driving, at several levels, substantially straight, parallel and horizontal drifts through the entire lower part of a block, choosing the distance between the drifts of each level so that remaining supporting pillars will cover at least 40% of te block area, undercutting the block from the drifts by blasting down the covering and adjoining parts of the drifts at each level so that the drift openings toward the undercut area and the drift coverings will be arranged in a stepped configuration, the drift openings being utilized as draw-points for the caving material, the number of drift levels being chosen with regard to desired horizontal distance along the directon of the drifts between the draw-points at adjacent levels, and further blasting down said drift coverings to retreat the draw-points if cracks and cave-ins occur in the coverings at said drift openings.
7. A method for mining of rock or ore according to the block caving principle, comprising driving, at several levels, substantially straight, parallel and horizontal drifts into the lower part of a block, choosing the distance between the drifts of each level so that remaining supporting pillars will cover at least 40% of the block area, undercutting the block from the drifts from opposite sides of the block so that the drift openings toward the undercut area and the drift coverings will be arranged in a stepped configuration from said opposite sides of the block, the drift open-ings being utilized as draw-points for the caving material, the lowest draw-point level being located in the lower central part of the block, the number of drift levels being chosen with regard to desired horizontal distance along the direction of the drifts between the draw-points at adjacent levels, and further blasting down said drift coverings to retreat the draw-points if cracks and cave-ins occur in the coverings at said drift openings.
8. A method for mining of rock or ore according to the block caving principle, comprising driving, at several levels, substantially straight, parallel and horizontal drifts through the entire lower part of a block, choosing the distance between the drifts of each level so that remaining supporting pillars will cover at least 40% of the block area, undercutting the block from the drifts by blasting down the covering and adjoining parts of the drifts at each level so that the drift openings toward the undercut area and the drift coverings will be arranged in a stepped configuration, the drift openings being utilized as draw-points for the caving material, the number of drift levels being chosen with regard to desired horizontal distance along the direction of the drifts between the draw-points at adjacent levels, providing access drifts above said draw-points for taking down hangups formed by large boulders and for secondary blasting of said boulders, and connecting said access drifts to the draw-point drifts.
9. A method as claimed in claim 8, in which the connecting of the access drifts to the draw-point drifts is effected via a raise from the adjacent draw-point level.
10. A method as claimed in claim 8, in which the connecting of the access drifts to the draw-point drifts is effected via a horizontal drift from a higher draw-point level.
11. A method for mining of rock or ore according to the block caving principle, comprising driving, at several levels, substantially straight, parallel and horizontal drifts into the lower part of a block, choosing the distance between the drifts of each level so that remaining supporting pillars will cover at least 40% of the block area, undercutting the block from the drifts from opposite sides of the block so that the drift openings toward the undercut area and the drift coverings will be arranged in a stepped configuration, the drift openings being utilized as draw-points for the caving material, the lowest draw-point level being located in the lower central part of the block, the number of drift levels being chosen with regard to desired horizontal distance along the direction of the drifts between the draw-points at adjacent levels, providing access drifts above said draw-points for taking down hangups formed by large boulders and for secondary biasing of said boulders, and connecting said access drifts to the draw-point drifts.
12. A method as claimed in claim 11, in which the connecting of the access drifts to the draw-point drifts is effected via a raise from the adjacent draw-point level.
13. A method as claimed in claim 11, in which the connecting of the access drifts to the draw-point drifts is effected via a horizontal drift from a higher draw-point level.
14. A method for mining of rock or ore according to the block caving principle from a long ore or rock mass, said mass comprising a plurality of adjoining blocks, said method comprising longitudinally driving, at several levels, substantially straight, parallel and horizontal drifts into the lower parts of a plurality of adjoining blocks choosing the distance between the drifts of each level so that remaining supporting pillars will cover at least 40% of the area of said blocks, undercutting the blocks of said mass from the drifts in such a way that the drift openings toward the undercut area and the drift coverings will be arranged in a stepped configuration, the drift openings being utilized as draw-points for the caving material, the number of drift levels being chosen with regard to desired horizontal distance along the direction of the drifts between the draw-points at adjacent levels, providing access drifts above said draw-points for taking down hangups formed by large boulders and for secondary blasting of said boulders, and connecting said access drifts to the draw-point drifts.
15. A method as claimed in claim 14, in which the connecting of the access drifts to the draw-point drifts is effected via a raise from the adjacent draw-point level.
16. A method as claimed in claim 14, in which the connecting of the access drifts to the draw-point drifts is effected via a horizontal drift from a higher draw-point level.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE7410589A SE404620B (en) | 1974-08-20 | 1974-08-20 | PROCEDURE FOR BREAKING ROCK OR ORE ACCORDING TO THE BLOCKRAS PRINCIPLE IN MASSFUL BODIES |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1044708A true CA1044708A (en) | 1978-12-19 |
Family
ID=20321936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA233,703A Expired CA1044708A (en) | 1974-08-20 | 1975-08-19 | Method for mining of rock or ore according to the block caving principle in massive formations |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US4072352A (en) |
| CA (1) | CA1044708A (en) |
| SE (1) | SE404620B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4938536A (en) * | 1989-11-22 | 1990-07-03 | Lee Raymond C | Conic mass caving structure and method |
| CL2008003560A1 (en) * | 2008-11-28 | 2009-05-04 | Corporacion Nac Del Cobre De Chile | Method for the continuous extraction of mineral in underground works, destined for the permanent production of extraction from the points of exploitation, includes building exploitation galleries, in which the center defined by a group of galleries crosses a street to transport ore, and preconditioning of rock. |
| CN102031971B (en) * | 2010-11-18 | 2012-10-31 | 河北联合大学(原河北理工大学) | Method for determining structure and thickness of open-pit-to-underground covering layer |
| CN102383801B (en) * | 2011-06-07 | 2013-03-06 | 中钢集团马鞍山矿山研究院有限公司 | Quantitative determining method for reasonable thickness of covered rock layer by using stope caving method |
| CN102444403B (en) * | 2011-12-27 | 2014-05-07 | 西南科技大学 | Pillarless sublevel caving method based vertical partitioning and combined ore drawing extraction technology of gently inclined ore bodies |
| RU2515285C2 (en) * | 2012-04-02 | 2014-05-10 | Открытое акционерное общество "Научно-исследовательский и проектный институт обогащения и механической обработки полезных ископаемых "Уралмеханобр" (ОАО "Уралмеханобр") | Method to develop edge ore bodies with unstable ores |
| RU2502872C1 (en) * | 2012-07-20 | 2013-12-27 | Федеральное государственное автономное образовательное учреждение высшего профессионального образования "Северо-Восточный федеральный университет имени М.К. Аммосова" | Development method of thick steeply dipping ore bodies |
| CN107654232B (en) * | 2017-11-15 | 2019-08-06 | 长沙矿山研究院有限责任公司 | The moat ditch collection mine mining methods of inclined orebody |
| CN108952723A (en) * | 2018-08-08 | 2018-12-07 | 中国恩菲工程技术有限公司 | The spatial arrangement structure of the ore removal level of ore body |
| RU2720040C1 (en) * | 2018-11-06 | 2020-04-23 | Акционерное общество "ВНИИ Галургии" (АО "ВНИИ Галургии") | Combined method of high-capacity bin boring |
| CN114000881A (en) * | 2021-11-03 | 2022-02-01 | 金川集团股份有限公司 | Non-pillar sublevel caving method mining method under large-area cemented filling body |
| CN114427463B (en) * | 2022-01-25 | 2022-11-15 | 长沙矿山研究院有限责任公司 | Deep deposit downward approach type plate area partition unloading layering advanced pressure relief stoping method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US906765A (en) * | 1908-08-11 | 1908-12-15 | William G Anderson | Method of mining. |
| US1502030A (en) * | 1922-07-01 | 1924-07-22 | Goodney Samuel John | Process of mining soft ore |
| US1842664A (en) * | 1931-03-03 | 1932-01-26 | Morris J Elsing | Method of mining |
| US2298599A (en) * | 1941-03-15 | 1942-10-13 | Mark A Smith | Block cave mining method and plant |
| US2536869A (en) * | 1946-06-22 | 1951-01-02 | Philip B Bucky | Mining method |
| SE364339B (en) * | 1972-06-28 | 1974-02-18 | Luossavaara Kiirunavaara Ab |
-
1974
- 1974-08-20 SE SE7410589A patent/SE404620B/en unknown
-
1975
- 1975-08-18 US US05/605,465 patent/US4072352A/en not_active Expired - Lifetime
- 1975-08-19 CA CA233,703A patent/CA1044708A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| SE7410589L (en) | 1976-02-23 |
| US4072352A (en) | 1978-02-07 |
| SE404620B (en) | 1978-10-16 |
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